What is the difference between the flat faced tools and the round faced tools?

What is the difference between the flat faced tools and the round faced tools?

The magnetic strength on the surface of the flat faced MDR tools is the same over the full face of the tool. With the RATs, the full strength of the magnet is focused to the apex of the dome, providing increased power for more difficult dent removal operations, and increased power to remove dents form smaller tubing. The increased focused power of the RATs enables removal of wrinkle, ping and crease dents that resist removal with the flat faced tools.